Langmuir–Blodgett films of rhodopsin: an infrared spectroscopic study

Pepe, I.M.; Ram, Manoj K.; Paddeu, Sergio; Nicolini, Claudio

doi:10.1016/s0040-6090(98)00611-7

Cited by 11 publications

(9 citation statements)

References 19 publications

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“…Other protein having α ‐helix structure is rhodopsin, which can be found in the eye retina. IR spectroscopy with bovine rhodopsin Langmuir–Blodgett films, showed an absorption peak in 3295 cm −1 ; the theoretical result presents 0.03% error relative to this experimental result.…”

Section: Resultsmentioning

confidence: 79%

“…Normal Hair [33] 3066 3300 0.12 Hair without cuticle [33] 3062 3295 0.03 Horse hair [33] -3293 0.09 Goose feather [34] 3100 3300 0.12 Swan feather wing [35] 3070 3290 0.18 Horse hair [35] 3080 3295 0.03 Rhodopsin (Retina eye) [36] -3295 0.03 sodium-potassium pump [37] -3285 0.33 (Table 7). Table 8 summarizes the results discussed above.…”

Section: Results For Oh Groupmentioning

confidence: 99%

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Quantum confinement in hydrogen bond

Santos

Filho

Ricotta

2015

Int J of Quantum Chemistry

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In this work, the quantum confinement effect is proposed as the cause of the displacement of the vibrational spectrum of molecular groups that involve hydrogen bonds. In this approach the hydrogen bond imposes a space barrier to hydrogen and constrains its oscillatory motion. We studied the vibrational transitions through the Morse potential, for the NH and OH molecular groups inside macromolecules in situation of confinement (when hydrogen bonding is formed) and non-confinement (when there is no hydrogen bonding). The energies were obtained through the variational method with the trial wave functions obtained from Supersymmetric Quantum Mechanics (SQM) formalism. The results indicate that it is possible to distinguish the emission peaks related to the existence of the hydrogen bonds. These analytical results were satisfactorily compared with experimental results obtained from infrared spectroscopy.

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Section: Resultsmentioning

confidence: 79%

Section: Results For Oh Groupmentioning

confidence: 99%

Quantum confinement in hydrogen bond

Santos

Filho

Ricotta

2015

Int J of Quantum Chemistry

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show abstract

“…Bacteriorhodopsin (bR) and other light-sensitive proteins, including visual pigments (rhodopsin) from bovine, [1][2][3][4] photosynthetic reaction centers 5 are of interest for use in biotechnology and molecular electronic applications. [6][7][8][9][10] The unique combination of photochromic, photoelectric and electrooptical properties of these proteins is of great fundamental and applied interest.…”

Section: Introductionmentioning

confidence: 99%

Photoreversibility and photostability in films of octopus rhodopsin isolated from octopus photoreceptor membranes

Paternolli¹,

Neebe²,

Stura³

et al. 2008

J Biomedical Materials Res

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In this work, a new biomaterial resulting from the isolation of octopus rhodopsin (OR) starting from octopus photoreceptor membranes is presented. Mass spectroscopic characterization was employed in order to verify the presence of rhodopsin in the extract. Photoreversibility and photochromic properties were investigated using spectrophotometric measurements and pulsed light. Thin films of OR were realized using the gel-matrix entrapment method in polyvinyl alcohol solution. The results indicate that the photoreversibility and the photostability of the OR in gel-matrices are maintained. Several measurements were performed to test the stability of the resulting biomaterial in time and at room temperature. Preliminary tests demonstrate that the photoreversibility and the photostability are still found after few days from the biomaterial preparation and after the exposure for several hours at room temperature.

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“…Bacteriorhodopsin (bR) and other light‐sensitive proteins, including visual pigments (rhodopsin) from bovine,1–4 photosynthetic reaction centers5 are of interest for use in biotechnology and molecular electronic applications 6–10. The unique combination of photochromic, photoelectric and electrooptical properties of these proteins is of great fundamental and applied interest.…”

Section: Introductionmentioning

confidence: 99%

Studies of different kinds of fiber pretreating on the properties of PLA/sweet sorghum fiber composites

Zhong

Zhang

et al. 2010

J of Applied Polymer Sci

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In this article, truly degradable composites were prepared using sweet sorghum fibers which are residue of ethanol fermentation industry as reinforcement and renewable resource-based biodegradable polyester, poly (L-lactide) (PLLA) as matrix, they were fabricated by meltblending. The effect of different kinds of pretreatments (dilute sulfuric acid pretreatment, mild alkaline/oxidative pretreatment, steam explosion pretreatment) on mechanical properties of composites were investigated. Besides the composition of untreated and treated fibers as determined by Van soest method, Fourier transformed infrared (FTIR) spectroscopic and scanning electron microscopic (SEM) were also used to study the change of sweet sorghum fibers before and after pretreatments. Mechanical proper-ties testing indicated that tensile strength and impact strength of PLLA/treated fibers were improved except the dilute sulfuric acid pretreated fibers reinforced PLA composite. The mild alkaline/oxidative pretreated fiber reinforced PLA composite showed highest tensile strength of 46.12 MPa and impact strength of 8.02 kJ/m 2 which was 15.5 and 33% higher than that of the control. The SEM of impact fracture surface and DMTA test were carried out to investigate the interfacial morphology and interfacial adhesion between the fiber and matrix.

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Langmuir–Blodgett films of rhodopsin: an infrared spectroscopic study

Cited by 11 publications

References 19 publications

Quantum confinement in hydrogen bond

Quantum confinement in hydrogen bond

Photoreversibility and photostability in films of octopus rhodopsin isolated from octopus photoreceptor membranes

Studies of different kinds of fiber pretreating on the properties of PLA/sweet sorghum fiber composites

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